Grinding machine



NovQig i924;-

3,516,103 J, KELLER GRINDING MACHINE Filed Sept. 2, 1922 4 Sheets-Sheetl Nav, 18, w24. 1,516,103

J. KELLER GRINDING MACHINE Filed Septf? 1922 Sheets-Sheet 2 .L if L www3Nov; 18, 1924 J. KELLER GRNDING MACHINE Filed sept. 1922 -4 sheets-sheet4 atented Non. l, i924.

U hi l T m JEREMIAH KELLER, 0F CANTGN.

HIY. ASSEGNOR TO THE TIMKEN ROLLER BEARING- COTJIFANY, OF CANTON, OHIO,A CGRPORATION OF OHIG.

GRINDING .TYACHINE Application filed September To all whom z' mayconcern Be it known `that. l, .lnnnnxan Kama-1n, a citizen of the.United States, and a resident of the city of Canton,A county ot' Starkand State ot' Ohio, have invented a new and useful Improvement inGrinding Machines. of Which the following is a specification.

My invention relates to grinding machines and particularly to machinesfor grinding the ends or rolls, for roller hearings. The principalobject of the invention. is to provide for automatically grinding theond edges of rolls for roller bearings.

The invention consists principallfv in mounting the oscillatahlygrinding wheel in automatic means for feeding the rolls into position tobe ground, in means for c iccting the finished rolls, and in nieans forfeeding the grinding Wheel to compensate :lor wear. The inventionfurther .consists in the parts and combinations and arrangements ot'parts hereinafter described and claimed. ln the drawings which form partof this specification and wherein like characters indicate .like partsWherever they occur:

Fig. l is an elevation ot' a grinding machine embodying my invention;

Fig. 2 is a top plan 'View thereof, the support; for the roll hopperbeing broken 0 away and certain parte being shown in section;

Fig. 3 is a vertical sectional View' thereof;

Figs. l and 5 are sectional views along the lines 4-4 and 55respectively in Fig. 3;

lfig. 6 is a fragmentary end view nidicated by the line 6-G in Fig. 3;

Fig 7 is a sectional view along the line 7 7 in Fig. 6;

Fig. 8 is a horizontal sectional View along the line 8 8 .in Fig. ii

Fig.' 9 is a sectional View along the line -9 in Fig. 2;

Fig. lO is a sectional View along the line 10-10 in Fig. 2;

Fig. 11 is an elevation of the pawl and ratchet by which feeding oi' theemery wheel is accomplished, and of the cme wheel hanger; l Fig. l2 is asectional View along the line 12-12 in Fig. 8;

'Fig'. 133 is a horizontal sectional View of the emery wheel supportingbracket showing the means for feeding the emery Wheel forward;

2, 192k. Serial No. 585,932.

Fig. a .diagrammatic View showing the electric circuit. governing theeinery Wheel feeding means; and

Fig. 15 is a fragmentary sectional view on a larger scale of a rollcarrying member.

@n a suitable hase l is mounted a housing 2 containing the mechanism foroperating the rotary indexing head 3 that contains the rolls 4, and torrotating a roll 4 lacing ground. li'iounted on the top of said lionsingQ is a pedestal 5 `aving an enlarged head o on which mounted a hopper ior container that holds a supplyv oi rolls to he ground. Also mounted onthe housing 2 is a bracket 8 that supports the mechanism for supportingand operating an emery wheel 9 that is disposed alongside of the housingin position to grind the beveled end ot a roller J.- hcld in theindexing head 3 and proj ecting from the housing. Rotatably mount ed inthe housing 2 is a main driving shaft l0. on Whose projecting end ismounted a. pulley wheel l1 or the like that may be driven .from anysuitable source of power.

The bottom of the hopper has a tubular extension 12 that makes a snuglit with the head il oi the pedestal whereby the hopper is secureljvmounted on the peoestal. A shaft i3 rotatably :mounted in said pedestal5 and a liber disk H- or the like is secured thereto. Resting on saidfiber disk and mounted on thc shaft. is -a conical disk l5 whose bevelededge is adapted to cooperate with rollers in the. hopper. Secured on therertical sha ft E3 above said tapered disk 15 is a second iher disk '16that is pressed against said tapered diskA hy a spring 17 secured to theshattby means of nuts 18 and bearing on said friction disk. The upperend of the shaft. 13 projects above the top of the hopper and is.provided with a handle/ll) for turning it. Preferably a metal, ring ,2Uhaving e beveled inner edge is mounted in the top of the head 6 of thepedestal and said pedestal is provided with a tapered groove 2l belowSaid ring, a clumnel thus being formed that is adapted to receiveconical rolls with their smaller ends 5' down. rlhe rolls in saidchannel are 'moved along in the channel by the trictional con- .taet ofthetapered dish 15.

Said disk 15 is rotated oy said shaft 13, as above pointed out. In caseof a jam, the

frictionalmounting of the tapered disk 15 will permit it to slip on theshaft, thus avoiding damage to the machine.

The shaft 13 is provided with a gear 22 at its lower end, said gear 22meshing with a gear 23 mounted on a suitable shaft 24 on top-of thehousing. Mounted on said shaft above said gear 23 and secured thereto isa ratchet gear 25 that is rotated by a pawl 26 that is pivotally securedto the end of a'vertical shaft 27 mounted in a suitable bearing member28 in said housing. A spring 29 is secured to the end of the pawl 26 andto the shaft. This spring 29 holds the pawl 26 against the ratchet gear25 and onV the back strokeof the pawlf 26, the ratchet gear 25 isrotated backward a short distance by said pawl 26 riding lover it. Thisbarkward rotation of the ratchet wheel 25 is limited by a second pawl 30whose end is secured to the shaft 24 by a spring 31. This slightbackward movement prevents jamming of the rolls in the hopper channel.l

Said shaft 27 is provided with a bevel gear 32 at its lower end thatmeshes with a bevel gear 33 on the main driving shaft 10 of thelmachine.

. At one point, an opening 34 `is provided in the bottom of the channelin. the pedestal head 6. A. tube 35 is secur d tothe pedestal, opening'into said vchan el opening',l the lower end of the tube being securedto the top of the housing 2 and opening into it. Slidably mounted on asuitable member 36 secured to the housing is a plunger 37 to which issecureda portion 33 having a hole 39 therethrough adapted to receive aroll 4 from the tube 35 and deliver ittoa passageway 4() in said pluger-supporting member 36. Said member @E is provided with a verticalslot 41 opening into said passageway. The passageway curves from thevertical to the horizontal, so as to deliver a roll into the .opening ina spindle 42 of the 1ndexing head 3. Al spring 43 issecured to thehousing,l as byscrews 44 and projects into the horizontal portion of.said passageway 40 tobear against a. roll therein.

'Secured to the end of the roll "receiving portion 38 of the plunger 37is 'a projecting lug 45 that -is provided with ra'slot in which ismounted a depending finger 46. The shank portion" of the fi ger 46'issecured in said slot by meansof asuitable screw 47. The linger 46 isinalinement with the slot 41 in the roll receivingmember 36 and when theplunger 37 moves to receive another roll from the ltubesaidfingerextends into said slot and presses a roll from the passagewayinto the hole inthe spindle of the indexing head. :Secured to theprojecting member 45 of the plunger 37 is .an arm 48 in which. is

lmounted a .s'rew 4 9 Whose end abuts against may be turned to adjustthe stroke of the plunger, if required.

Indexing head.

The circular indexing head 3 is mounted on a,suitable shaft 50 and isprovided with four hollow spindles 42 in each of which is mounted ahollow piston 51, the outer end of whose bore 52 is conical to receive aconical roll 4 from the roll passageway 40. lhe end of each piston isprovided with an annular slot 51EL in which is mounted a sleeve 5l" thathas an outwardly extending and rebent flange 52c at the end, thisarrangement preventing dust from entering between the spindle 'andpiston. Mounted in grooves on each of said pistons 51 is a plurality ofsplit rings 53 or bushings that are preferably ot' bronze and that tendto prevent the piston 51 from turning in the spindle 42. Preferably tworings 53 are mounted in each groove, the combined width of the ringsbe-A 53b that i's fixed in the piston 51. Any ro.

tary movement of the piston tends to spread the rings 53 so that thepiston is frictionally held in its spindle. Mounted vin the bore of eachpiston 51 is a plunger 54 that has an enlarged portion 55 that tits inthe bore of the piston 5l and that has a reduced portion 56 projectingbeyond the inner face of the indexing head 3. The plunger' 54 is adaptedto force a finished roll out of the piston, as will be described later.At the same time the enlarged portion 55 of the plunger 54 forces thepiston 51 outwardly in the spindle 42. On the rollfeeding stroke ot' theroll feeding plunger 37, the piston is forced inward the distance lixedby the limit screw 49.

Mounted on the vertical shaft 27 in the housing above the bevel gear 32is a cam 57 in which rides a cam roller 58. Said cam roller 58 issecured lto an arm 59 that 'is mounted on a hollow cylinder 6() that issleeved on a suitable rod 61 vin the' housing 2. Secured to the top ofsaid hollow c 'linder 6() is an arm 62 Whose end has a projection 63that. extends into an opening in the end ot`the roll feeding plunger 37.the other end of the cylinder is an arm 64 whose end is in alinementwith the extension 56 of the plunger'54 in one of the pistons. Thus,therocking of the cam arm 59 moves both of the arms 62, 64 back andforth, to movethe roll feeding plunger 37 Secured to-v and also to movethe-roll ejecting plunger i on the shaft 50 that supports the withradial slots 66 at angles of ninety degrees. The portions 67 ofthe starwheel between the slots 66 are arcuately curved.

Mounted on the main. driving shaft 10 is a disk v68er master wheel thatis provided with a pin 69 that is adapted to extend into a slot 660i thestar wheel and rotate the star wheel through an angle ot ninety degrees.The master wheel 68 is provided with an arcuate flange 70 t-hatengages acurved portion 67 of the star wheel to prevent rotation thereof.

Mounted Ain the upper part of the housing 2 is a pulley .71 andadjustably mounted in the vlower part of the housing, as by means of ascrewl 72 extending through a slotted member 78 secured .in the housing,is a second pulley 7 4 that cooperates with said first mentioned pulley.Mounted on said pulleys 71 and 74 is a belt 75 that is adapted tocontact with the projecting end of a hollow spindle 42, to drive'thesame while the roll therein is being operated onby the emery wheel 9.The upper pulley T1 is mounted on a horizontal shaft 76 that is driventhrough a suitable train of gears 77 by a gear 7 8 that is mounted onthe main driving shaft 10 of the machine.

Emery wheel supforting and draf-ving mec amsm.

Pivotally mounted on a stud 79 on top ol the housing 2 is the bracket 8.The bracket 8 is held in the desired position as by means of a screw 80secured to the housing and fitting in an arcuate slot 81 in the bracket.Mounted in suitable bearings 82 on the bracket 8 is a hollow shaft 83 onwhich is mounted a hanger 84 or reciprocating frame. The shaft is heldagainst endwise movement as by means of a collar 85 that abuts against abearing.

Mounted in the hollow shaft 83 is a feed screw 86 that is provided witha ratchet wheel 87 at the end that projects out of the hollow shaft 83.Mounted on the feed screw 86 loosely enough to be able to rotaterelative thereto, is a collar 88 that overlaps the end of the hollowshaft 83 and is securedv thereto as by screws 89. The threaded end ot'the feed screw 86 tsin a threaded'hole in a member 90 that is secured tothe hanger 84 and that projects into the hollow shaft 83 through a slot91 therein. Thus, by turning the feed screw 86, the hanger 84 may becaused to move along the hollow shaft 83.

Mounted on a rotatably mounted shaft 92 disposed longitudinally in thelower end ot the hanger 84 is the emery wheel 9. A multiple rope pulley98 is fixed on said shaft 92 at about the middle thereof. A shaft 94.rotatably mounted near the top of the hanger has a pulley 95 thatcooperates with the pulley 93 on the emery wheel shaft 92 and Ais alsoprovided with a pulley 96 that may be driven from any suitable sourceot' power. Said shafts 92, 94 are preferably mounted in split bushings97. A Dhollow may be adjusted. The rod 99 maybe secured in the desiredposition by a set screw 102.

Emery wheel rocking mechanism.

A suitable vgear 103 is formed on the end of thc main driving shaft 10and cooperates with a larger gear 101` on a horizontally disposedcounter shaft 105 that is rotatably mounted in the housing 2 parallelwith the main driving shaft. A second gear 10G on said counter shaft 105cooperates with a gear 107 on a stub shalt 108 in alinen'ient with themain driving shaft .10. shaft. 108 is driven in the same direction asthe main driving shaft but at a reduced speed. Said stub shat't 108 hasa portion projecting from the housing and an eccentric 109 is securedthereto. A' rod 110 extends upwardly from said eccentric and is threadedinto a second rod 111 that is Secured at its upper end to a projectingportion ot the hanger 84, by means ot a bolt 112 itting iu a slot 113 insaid hanger. Thus, as the main shat'l 10 rotates.v the eccentric 109 isrotated. "l'his causes an up and down niovement of the rods 110, 1.11which, in turn, causes a back and forth rocking movement of the hanger81 that supports the emery wheel 9. On each stroke of the hanger thecniery wheel 9 passes a roll. 4; and grinds the beveled edge thereof.

h'lounted to cooperate with the ratchet wheel 8T, as by a pivot piu 114secured to a member 115 projecting upwardly from one of the hollow shallbeariiigs is a pawl 116. The pawl 116 has an elongated arm 11T extendingalong the ratchet wheel 87. The weight ot said arm tends to keep thepawl 116 out ot' engagement with thc ratchet wheel 8T. Mounted on thehousing 2 is an electro-magnet 118 adapted to attract the treo end 11';ol the. pawl 116 to torce the other end thereof into engagement with anotch ot' the ratchet wheel 8l'. lvlhen said pawl 116 is in engagementwith the ratchet: wheel 8T, the wheel 87 and screw 86 are prevented fromrocking in one direction. Thus, when the hanger 8#1 rocks in thatdirection, it is fed along the hollow' shaft 83, since said screw 80 isheld stationary and the hollow shaft is held against endwise movejnient.

An arm 119 that is secured to the hollow shaft 83 (preferably near oneof the bearings 82) is provided with a Contact screw 120 at its end.Secured to the bearing eas- Thus said ing is a support 121 to which issecured an insulated `yoke 122 with its arms depending. Secured to oneof said arms is an electrical switch member 123 whose free end isdisposed above the Contact screw 120 of the rocker arm 119 .Secured tothe other-arm of the yoke 122 is va switch member 124: whose free end isabove the freeend ot the first switch member 123. These switch members123, 124 or contacts are bioiiglit together at the end of the clockwiserocking of the hollow shaft as shown in Fig. 1U. One of said switchmembers is electrically connected with a source ot electricity 125which, in turn, is connected with the electromagnet 118 and the otherswitch member is connected with a switch -member 126 that is disposednear the roll being ground. Said switch member 126 is vmounted in asuitable casing 127 that is secured to the housing 2. Rotatablv mountedin said casing 127 is a disk 128 that is adapted to bear against thebeveled edge of a roll 4 being ground. Said gaging disk 128 is pivotallymounted on a lever 129, the end ot' which is adapted to bear against.said switch member 126 and make it contact wit other switch member 130in said casing, which switch member 130 is electrically counected withtheelectro-magnet 118. 'lhe gaging disk 128 is so adjusted that when itbears against a roll whose end is not ground off enough, the switchmembers 126, 180 will be pressed together whereas, when the r'oll issufficiently ground off the switch members will remain separated. .It

`v .will thus be seen that for a circuit-to be closed through theelectro-magnet thus at-v tracting 'the end of the pawl and causingfeeding' of the emery Wheel supporting ghangcr, `it is necessary thatboth sets ot .switch members be closed. An adjusting .screw lOigismounted in said housing with its end engaging the switch member 130; sothat the position of said switch member may be adjusted. 1 I

At' the end of the clockwise rocking moyeinent of the hollow shaft 83,the switch members 123, 124 governed thereby are forced together; andif, at that time, the roll that has just been ground `is notsutlieientlyground, the switch members 126, 130

j governed by said roll will also be i-n contact, thus closing a circuitthrough the electro- 4magnet 118, attracting the end of the pawl 116,preventingrotation thereof and of the feed screw 86 and causing thehanger 84'to be fed along the shaft. be repeated each time thataninsufficiently ground roller is in contact with the gaging disk 128 whenthe arm of the hollow shaft forces its switch members 1231., 124together. When asudiciently ground roller is in contact with the gagingdisk 128, noicircuit is closed through the electro-magnet even ii the.

`tion shown. This feeding will hopp and the power for driving the maL 7chine isctiirned on; In order to start the operation ot' the machine.the handle 19 'is preferabl)y turned by hand thus filling the channelwith rolls and jteeding a rollinto the tube 83. The operation of theplunger ,75

3T forces a roll into the roll receiving member 38 and thence into thepiston ofa' spini die I2 of the indexing head. The piston:A is forcedinto the spindles() that the roll projects the proper distance'from thespin- 80 dlc. The rotation of the indexing hea-d brings a roll inposition to be operated on hv the einerv wheel 9 and t-lie oscillationofy the eiiier \v 'heel hanger Jforces the emeryfjA wheel across thebevelededge of the roll, `grinding ofi' said edge.

Il: the parts are'l properly adjusted. the roll' will be sind, cientl'yvground and. as above described, no circuit will be closed through theelectro-...

magnet L18. and the feed screw 86 will con- 90 tiiiie to rock with thehanger 81 and: shaft. 'l`lit` indexing head will then be turned by theoperation of the star wl1eel,'aiid the ground roll will be in alowermt'ist position,

wlicic` on the stroke ot' the lower arm oper- 95 ated by the cani. thepiston pliingerfl willi be caused to eject said'ro1l. In the fourthposition of vthe indexing head, the spindle is empt)7 and no workisdone. On each stroke of the einery wheel, it grinds the edge of aroll. y n] i I The operation of the machi e cpntiii-ues until the emerywheel is worn d wn so/that/I it does not grind off a sufficient amountotthe roll; and then'ythe yelectric eircuitabove 1105 described will be4closed to feedthe emery wheel nearer to the work. c j f Atteinthe emerywheel is completelyworn down, and is replaced witlra new one, the

ratchet wheel is vturned back byrh'and. to'll putthe eincry wheel inproper position. y

The machine above described has nu!11f?,r.-l

ous advantages. It 'provides automatic `and. i,

accuratemeans Yfor positioningy the rollsltoV the ground and for.operatingt` theucmeify 1,15*

wheel. The operation of the lmachine is en v tirely automatic and ittakes care of the@` wear ofthe emery wheeL `bvroiisly,,m1-

me-rous 'changes .mayl be ma( e without dc- 1,

parting vtrom my invention ani-ll do ntzfl wish to be limitedto theprecise constiic,

what I nim is.: j

1. A grinding machine comprising?a'I rbll'il carrier, a rotatablegrinding wheeldisposed il obliquely with relation tothe axis of carrierin `position .to bevel the end. edge Aef a j roll in said carrier, meansfor oscillating said' grinding wheel and means for bringing :a new rollinto position to be beveledafterf-W monos the grinding wh'eei has passeda roii, Whereby the end of u roii is beveled on each swing ing movementof the grinding wheei.

2. A grinding machine comprising a pivotaliy mounted arm, a grindingwheeil rotaiably mounted at the end of said arm and for roi/ting saidgrinding wheeh means for oscillating' Suid arm, :1nd a roi] supportrotatabiy mounted in such position that the end edge of :i` roiithereinwvli he in the path Of'osciliation of said grii'xding wheei, Suidgrinding Wheel being disposed obiiqueiy with reiaion to tho axis of theroll.

,3. A grinding machine comprising e grinding w ieei und means `forrotating ,and

osoiiiating Ashe suino and :i roll support. hur- -position io be groundby Suid grrinfiinf ing e plurality of chucks euch adapted 'io Contain ayroii ro be ground, Suid roii support being rotatably monnied in suchposition that the end edge of a roii in one of Suid chucks will lie inthe path of oscillation of said grinding Wheel, and Ineens for rotatingSaid roii support to bring a new roi! intro position to be ground aftereuch osriihition of the grinding wheel.

4. A grinding' nizrrhine Conni-rising :i grinding Wheeiand means 'forrotating :uni Oscillating the Sarno, roii suppor rotatably mounted inSuch position 'that -he end edge of a roll therein Wiii iie in the mthof osciiiation of seid grinding u'heeii, :1nd means governed by a roiibeing ground for feeding salid grindinlgw wheei town 'de he roi supp'or.

5. A grinding machine comprisin :rfi per, a grinding' Wheei,V arotzieoie' in adapted and arranged to ceri-y 'ro is. imo

Wheel, means for feeding' rolls iron; sein hoppor to said hearh Suidmenne con'iprising a channel of conical section in the, hot-toni of Saidhopper, nu openiifigfy in tho hotoin of said channel` ineuns forfoedinrgy roiis along Said ohzinnohto Suid opening, u piungor hilving anopening herothrough, u iuhr icedin from said openingF in seid rhunnei,und plunger being ino'vuhie to bring' the noie therein intoalinemri'itf/with /the ond :haiti tubo to receive o roil therefrom, :inienihri' having i passageway therethrough udnprd t0 receive-a roii fromsaid plunger, nuuns for transferring u roii 'from enitposean way to saidroiinbir houd, suenos i'or .rotating Suid hond et intervnis, und invianot'or ejeciing finished roiis therefrom.

6. grinding' muriiuo comprising' u hop por, u. grinding wheel, urotutubie houd `adapted und arranged to rurrjr roiin` into io- Sition tobo ground by .Suid L'i'iidinrr wheoi, means for i'eot'hngr rolle fromsuiiubopper io `Said heed, Suid ineainr; comprising vfehnunei of Conicaisection in. ihr, bottom of said hop per, en oponinlg in Lne boioiu ofSuid rhonnei moans; for i'oriiiino; roiis along Suid chen-- nel ro seidopt ugr, :i ptunger having :in

opening therethrough, u tube lending from said opening in Suidrhenneh'nnd Suid plunger being movable to bring the hole therein. intoaiinenient with the Iend of Suid tube to receive a roii therefrom, amember having: n, pes'sagewoy thoreinrough adapted to rereive a roiifrom said piunger, said member hziving slot opening ino Said'pzissugeivuig Ineens for transferring a roii from said im Sogeu'uy -tosaid rotatable heed, Suid ineens comprising' :i finger Carried by saidplunger and adapted to extend. ino seid slot to uhu'. uguins :i roii inSuid puseugg'ewuyf menus for rotating Suid heed inevuis und .ineens foriniehod roiio therefrom.

'i'. A grindingA machine coniprieing u bopper, n grinding ivi'ieei, :irotutiiiile hrud adapted and arranged ro Curry rolis. into pf siion tohe l iground by amid grinding wheeh means for feeding roiis `from Suid.hopper to Seid her-id. Suid menne (.-tungn'ising a channel of conicalsection in the hotiom of Suid hopper, un opening in the bottoni of Suidchunnei, nie-uns for feeding' roiis along' Suid #hunnei to Suid opening.Suid invano iurhxdiir;l :i rouzibio ronirui disk udiipird to heuragainst the Sitios of rolls in Suid rimuovi. :i plunger haring un'opening therethrough. u tubo leading from Suid opuninrv in huid thun--noi, und said i v:niger beiuh" morzibio to bring the hole therein intontineuient wih the end of Suid iube to roreire u roii their in, nirznberhaving :i puseugowuv thorernrough adapted to receive u roli from Suidpiungor, Saud member having :L Shit; open-- ing into Suid passageway,menus for tranl` foi-ring; o. roii from huid l'nissugewuy to .Quidrotziebie hoed, Suid ineens comprising :i iingerozirried by Suid piungorund adopted io eiiend into Suid Slot to abut, against n roi! in saidpassageway, ineens for rotziiiiu,r Suid head ui intervals und incarneYfor @jerking finished roiis therefrom.

tr. grrrinding nuirhinr comprising :t huir gior. i grinding whorh urotuiuiih houd. hoh iow :spindirs in Suid houd urluiittd und ur-vrnngoti to mirri roiis into position io ho ground by said riniiin;rfhrr-i, snrnns for fredingj roiis from Huid hoi'iptr io Suid spindie,Suid moans comprising' u rhunuei oil conirui srrfion in the boiioui ofSuid hopper, :in opening' iu the, bottoni oi' Suid rhzmnr-i, moons forfeeding roiis uiting Huid rhziuntei. to Suid oprningj, u Hunger burin;ron ope ing Hiorriu'tuigh, u fuhr. iruding from Suid opening in Huidrhuunoi, und amid piungijvr bringniovublo io bring ine hoie ihcrein inoniintniont with ihr und of said iubo io roreire u roi! therefrom umember huring u ptisifi'ug'euf'ny ihereihrmiggh adopted o rrrrifo u roiifrom sind phon sind member hu"- ing n eiot opening y said pussiufenvg-y,ne for 'tioneferrig u roii from uuid puoi in said hanger, a membersecured to said hanger and extending into`a slot in vsaidv shaft andprovided with a threaded opening, a screw threaded rod disposed axiallyof said hollow shaft and extending into the threaded opening in saidmember secured to said hanger, means for ,oscillating said hanger andmeans for preventing rotation of said screw, whereby when said screw isfree to rotate, it rotates as a unit with said hanger and hollow shaftand when said screw is held against rotation said hanger moveslongitudinally'of said shaft.

10. A grinding'machine comprising a hollow shaft rotatably mounted, ahanger mounted thereon, a o'rinding wheel mounted in said hanger, amember secured to said hanger and extending intoa slot in said shaft andprovided with a threaded opening, a screw threaded rod disposed axially-of Vsaid lio-llow shaft and extending into the threaded opening in saidmember secured to said hanger, means for oscillating said hanger. andmeans for preventing rotation of said screw, said means comprisingaratchet secured to the end thereof and a pawl adapted and arranged tocooperate with said atchet whereby when said screw is free to rotate, itrotates as a unit with said hanger and shaft and when said screw is heldagainst rotation, said hanger moves longitudinally of the shaft.

ll. A grinding machine comprising a hollow shaft, a hanger mounted onsaid hollow shaft, agi'inding wheel mounted on said hanger, a meinbeisecured to said hanger and extending into al slot in said ,fliollowshaft and provided with a threaded opening, a screw threaded roddisposedvaxially of said hollow shaft andgextending into the thread- 'edopening in said member secured to said hanger, a ratchet secured to theend of said threaded rod, apawl mounted to cooperate with said ratchettohold said threaded rod and screw `against rotation, means foroscillating said hanger, a roll support rotatably v mounted in positionto hold a` roll in the path of oscillation ofv the grinding wheel andmeanscontrolled by a roll and said holder 4for moving said pawl intoengagement with the ratchet, said means lcomprising lan elec'-tro-magnet adapted and arranged to attract one end of said pawl to forcethe other end thereof into engagement with a notch of said `atchet, aswitch adapted to close an electric circuit through said electro-magnetand a gaging member for controlling said disk, said gaging member beingin contact with a roll, whereby when a roll' is insutli'- ciently grounda current is closed through said electro-magnet, rotation of said screwis prevented and the hanger is moved along said hollow shaft.

l2. A' grinding machine comprising a hollow shaft, a hanger mounted onsaid hollow shaft,`a grinding wheel mounted on said hanger, a membersecured to said hanger and extending into va slot in said hollow shaftand provided with a threaded opening, a screw threaded rod disposedaxially of said hollow shaft and extending into the threaded opening insaid member secured to said hanger, a ratchet secured to the end of saidthreaded rod, a pawl mounted to cooperate with said ratchet to hold saidthreaded rod against rotation, -means for oscillating said hanger, aroll support rotatably mounted in position to hold a roll in the path ofoscillation of the ind- 90 ing wheel and means controlledby a roll insaid holder for moving said pawl into engagement with the ratchet, saidmeans comprising an electro-magnet adapted to'attract one end of saidpawl to force the other end thereof into engagement with a notch of saidratchet, a switch, a source of electricity connected Vwith saidelectro-magnet and one member of said switch, a second switch having itsmembers connected respectively with the electro-magnet and ,said firstmentioned switch, a/member secured to said hollow shaft and adapted toclose said first switch at the end of the rocking movement of said shaftand a gaging disk in con- 10e tact with a roll and'ada'pte'd to closesaid i A`comprising a plurality of hollow spindles,.a

'hollow piston in each of said spindles, the

end of the bore of each piston being adapted to receive an article, saidpistons having frictional engagement wit` said spindles, 'wherebymovement ol: each piston relative 125 to its spindle is possible andmeans for preventing dust or other foreign material from entering saidpistons. ,v i i 15. In a machine ofthe lkind set forth, a rotatableheadadantml t0 Support conical 130 rolls, comprising' a plurality olhollow spindles rotatably mountedA` :i hollow piston in each spindle,the end portion of the bore ot` each piston being conical to receive :ieonical roll, each piston fitting` tightly in its spindle and beingprovided with grooves, and split friction rings mounted in Suid grooves,whereby each piston rotates with its spindle and is Capable of endwisemovement therein.

16. In a machine of the kind Set Jforth. :1 rotatable head :idzipted tosupport eonleul rolls` Comprising :l plurulit)v ol` hollow spin ellesrotatnblvY mounted. u hollow piston iu euch spindle, the end portion ot'the bore of ezieh pistou bein;Y conical to receive :i eouirzil roll,xiu'h pistou litting' tightly in ils spindle und being provided withgrooves, two split trietion rings mounted in each of Suid grooves.y themeeting corners of Said rings being` beveled und pins secured to thepistons :ind cooperatingwith the beveled edges o't` the rings to causethem to enguge the Spindh; wher-eb)v @zieh piston rotates with itsIQpindle and is capable of endwise movement therein.

Signed :it (Hinton, Ohio. this 29th (lily of ugusl', 1922.

Certificate of Correction.

It is hereby certified that in Letters Patent No. 1,516,103, grantedNovember 18, 1924, upon the application of Jeremiah Keller, of Canton,Ohio, for an improvement in Grinding Machines, an error appears in theprinted specification requiring correction as follows: Page 5, line 6,claim 2, for the word and read means; and that the said Letters Patentshould be read With this correction therein that the saine may conformto the record of the case in the Patent Oiice.

Signed and sealed this 23d day of December, A. D. 199A.

[SEAL] KARL FEN N IN G,

Acting Commissioner. of Patents.

